Dont know if this is the right section and if it is can some one switch it..

Well i recently got a problem with my sierra 2000 Single cab.. The interior lights wont turn on.. The dome light wont turn on at all i tried it manually or automatically ovrride button too even changed the light switch and the cargo lamp switch and nothing... The ones under the dash dont turn on either.
The only ones that work are the Reading lights in front of the Dome light the two little circle ones.. but ONLY when the doors are closed if i open the door they shut down... Also my cluster says Cargo lights ON when i open the door or when i press the switch but they Dont turn on... the bulbs are good too
What could it be?? anyone have any Idea?
Fuses are good too... Inside and Outside...
Hate to use my phone flash to look for things or to enter the truck Darkly because domelight doesnt work

 

I have the same issue, hoping someone can tell me if the BCM needs to be replaced or more importantly how to troubleshoot the issue. I have one in a parts truck here and I want to know if I need to rob parts from it before I scrap it. 99 Silverado C1500.

 

ALso having the same problem. haha

 

It's annoying, anyone know what wire to test coming out of the bcm to see if it is the harness or the bcm? I have a used bcm I could have swapped into it, what does it usually cost to have it flashed to work with my truck?